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- Question
If sub class data member is hiding super class data member then how to access super class data member inside sub class methods?
- Correct Answer
- use super keyword super keyword points immediate super class Class Sample { int a =23; } Class Sub extends Sample { String a = "bablu"; void show() { Systemoutprintln(a); //bablu System out println(thisa); //bablu System outprintln(supera); //23 } } Class Demo { Public static void main(string[] args) { sub s = new Sub(); sshow(); } }
- 1. What is the fastest type of JDBC driver ? Discuss
- 2. What is a package? Discuss
- 3. Which of the following are valied?
Options- A. A class can extend any number of classes simulteneously
- B. A class can implement only one interface at a time
- C. A class can extend other class or can implement interface but not both simulteneously
- D. None of the above Discuss
- 4. X implements Y extends Z
Options- A. X can be class Y,Z are interfaces
- B. X is an interface Y,Z are classes
- C. X,Y are classes Z is an interface
- D. Complilation error Discuss
- 5. What is Marker Interface? Discuss
- 6. How can you make sure your dependencies are safe ? Discuss
- 7. What is the difference between creating String as new() and literal ? Discuss
- 8. How do you handle error condition while writing stored procedure or accessing stored procedure from java ? Discuss
- 9. Which is a reserved word in the java programming language?
Options- A. Variable
- B. Identifier
- C. Keyword
- D. Main Discuss
- 10. Which of the following best describes JavaScript?
Options- A. a scripting language precompiled in the browser.
- B. an object-oriented scripting language
- C. a low-level programming language.
- D. a compiled scripting language. Discuss
Technology problems
Search Results
Correct Answer: Type 4 (JDBC Net pure Java Driver) is the fastest JDBC driver Type 1 and Type 3 drivers will be slower than Type 2 drivers (the database calls are make at least three translations versus two), and Type 4 drivers are the fastest (only one translation)
Correct Answer: Package is a collection of related classes and interfaces package declaration should be first statement in a java class
Correct Answer: None of the above
Explanation:
A is wrong because a class can extend nly one class .B is wrong because a class can implement any number of interfaces.C is wronb because both can can be done simulteneously.So, D is correct
Correct Answer: Complilation error
Explanation:
It is a compilation error it should be X extends Y implements Z
Correct Answer: An interface without having any methods and by implementing that interface if our objects will get same ability such type interfaces are called marker interface (or) ability interface (or) tag interface
Correct Answer: When writing Nodejs applications, ending up with hundreds or even thousands of dependencies can easily happen For example, if you depend on Express, you depend on 27 other modules directly, and of course on those dependencies' as well, so manually checking all of them is not an option! The only option is to automate the update / security audit of your dependencies For that there are free and paid options: 1 npm outdated 2 Trace by RisingStack 3 NSP 4 GreenKeeper 5 Snyk
Correct Answer: When we create string with new() Operator, it?s created in heap and not added into string pool while String created using literal are created in String pool itself which exists in PermGen area of heap String s = new String("Test"); does not put the object in String pool , we need to call Stringintern() method which is used to put them into String pool explicitly its only when you create String object as String literal eg String s = "Test" Java automatically put that into String pool
Correct Answer: Stored procedure should return error code if some operation fails but if stored procedure itself fail than catching SQLException is only choice
Correct Answer: Keyword
Explanation:
Reserved words are words that cannot be used as object or variable names in a Java program because they're already used by the syntax of the Java programming language.
Java reserved words are keywords that are reserved by Java functions or other uses that cannot be used as identifiers (e.g., variable names, function names, class names).
If a reserved word was used as a variable you would get an error or unexpected result.
Examples : Int, Long, Abstract, Class, Break, Catch, Case, Public, Static, Void,...
Correct Answer: an object-oriented scripting language
Explanation:
JavaScript, often abbreviated as JS, is a high-level, interpreted programming language that conforms to the ECMAScript specification.
JavaScript has
* curly-bracket syntax,
* dynamic typing,
* prototype-based object-orientation, and
* first-class functions.
Uses :
It is well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat.
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